Which of the following are recognized U.S. national holidays?

The correct choice includes New Year's Day, Veterans Day, Thanksgiving, and Christmas, all of which are officially recognized national holidays in the United States.

New Year's Day, celebrated on January 1st, marks the beginning of the new year and is celebrated widely across the country. Veterans Day, observed on November 11th, honors military veterans who have served in the U.S. Armed Forces. Thanksgiving, celebrated on the fourth Thursday of November, is a day for giving thanks and feasting with family and friends. Christmas, celebrated on December 25th, commemorates the birth of Jesus Christ and is a significant cultural holiday observed by many across the nation.

In contrast, the other options contain holidays that are not recognized as national holidays. For instance, Valentine's Day and Halloween are widely celebrated but do not hold the status of a national holiday. Additionally, while Presidents' Day is recognized, it is not included in the identifying list of the correct option.